Jack is dating this girl Paula. He takes her out five times before he finally gets her back up to his apartment for coffee. They're fooling around on the couch, they move to the bedroom, and they have sex.

After it's done, Paula glances over at the nightstand and sees the box of Trojans. It's a 12-pack, but there are only five left in there.

"What happened to the rest of them?" she asks accusingly.

"Well... I masturbated into them," he says.

She accepts the answer, but she's curious. When she's with a few guy friends two days later, Paula asks them about it.